French study links red meat compound to 63% higher diabetes risk

Preliminary results from a French study have identified an association between elevated consumption of a naturally occurring compound in red meat and a up to 63% increase in the risk of developing type 2 diabetes. The research focused on N-glycolylneuraminic acid, abbreviated as Neu5Gc, a sugar produced by most mammals but lost by humans due to an ancient genetic mutation.

The NutriNet-Santé cohort analysis

Researchers tracked the relationship between Neu5Gc intake and diabetes incidence over more than seven years within the extensive French NutriNet-Santé study, which examines connections between diet, lifestyle, and health. Participants recorded foods consumed over three days, allowing scientists to estimate daily Neu5Gc quantities. During the follow-up period, which averaged 7.2 years, 966 new cases of type 2 diabetes were registered among the cohort.

The study participants had a mean age of 42 years, with women comprising 79% of the group. None of the individuals had type 2 diabetes or cancer at the start of the investigation. Scientists divided the subjects into five groups based on their levels of meat-derived compound consumption. Analysis revealed that those in the highest consumption group faced a 63% greater likelihood of developing diabetes compared to those in the lowest group.

Dairy versus meat sources

This association persisted after accounting for factors including age, sex, physical activity, dietary quality, smoking, and other health conditions, appearing consistently in both men and women. However, researchers did not observe a link between Neu5Gc derived from dairy products and increased diabetes risk. While total consumption of the compound from all food sources correlated with a 37% higher risk, this connection was largely driven by the red meat source.

Neu5Gc is present specifically in red meat, particularly beef and lamb, while appearing in smaller quantities in dairy products. When individuals consume foods containing Neu5Gc, the body can absorb the compound and integrate it into tissues. Because the human body does not produce it naturally, the immune system treats it as a foreign substance and generates antibodies against it.

Immune response and inflammation

Researchers suggest this immune response may lead to chronic inflammation, potentially explaining part of the observed relationship between compound consumption and type 2 diabetes. Lead researcher Dr. Leopold Fezeau, from Université Sorbonne Paris Nord in Bobigny, France, stated that the findings support the hypothesis that chronic inflammation could represent one mechanism linking red meat consumption to type 2 diabetes.

Fezeau noted the need for further studies to determine whether Neu5Gc itself is responsible for the association or if other components in red meat contribute to it. Researchers emphasized that the results do not prove the compound causes diabetes, as the study is observational. Additionally, the findings remain preliminary and may change once the full analysis is complete.

Although several risk factors were considered, the team could not rule out the influence of other lifestyle and social conditions. They also acknowledged the possibility of measurement errors in Neu5Gc consumption estimates due to reliance on food records.